How Much Do Common Roof Repairs Cost

Continue up the roof, ensuring each upper course overlaps the one below it by at least two inches. It’s important to ensure all your underlayment lies flat before you fasten it to the decking. Ripples and lumps can telegraph through the shingles and may be noticeable from the ground. Rolls of self-stick underlayment have a plastic backing to prevent the material from sticking to itself.

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